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Dear all,
I know this might be a simple and silly question but I am struggling with it
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2. Homework & Coursework Questions
Hey guys. I'm very new to Unix. I'm pretty fluent in Java and C, but I have never actually used Unix for anything. I am in an Operating Systems course now and I have an assignment to write a piece of code that involves forks and piping. I'm stuck.
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3. Shell Programming and Scripting
Hello,
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Hi ,
I have following code in my shell script :
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5. Shell Programming and Scripting
#ksh
Here is my code:
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Hi,
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Hi,
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Hi,
To explain this question I will have to go into a bit of detail. I hope you don't mind.
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All,
I am a UNIX novice with a question that I hope you can help me with.
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This may be the wrong category for posting my question, or it could be the perfect category to post. I have no idea how difficult my problem is.
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PTHREAD_ATFORK(3) BSD Library Functions Manual PTHREAD_ATFORK(3)
NAME
pthread_atfork -- register handlers to be called when process forks
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <pthread.h>
int
pthread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void));
DESCRIPTION
The pthread_atfork() function registers the provided handler functions to be called when the fork(2) function is called. Each of the three
handlers is called at a different place in the fork(2) sequence. The prepare handler is called in the parent process before the fork hap-
pens, the parent handler is called in the parent process after the fork has happened, and the child handler is called in the child process
after the fork has happened. The parent and child handlers are called in the order in which they were registered, while the prepare handlers
are called in reverse of the order in which they were registered.
Any of the handlers given may be NULL.
The intended use of pthread_atfork() is to provide a consistent state to a child process from a multithreaded parent process where locks may
be acquired and released asynchronously with respect to the fork(2) call. Each subsystem with locks that are used in a child process should
register handlers with pthread_atfork() that acquires those locks in the prepare handler and releases them in the parent handler.
RETURN VALUES
The pthread_atfork() function returns 0 on success and an error number on failure.
ERRORS
The following error code may be returned:
[ENOMEM] Insufficient memory exists to register the fork handlers.
SEE ALSO
fork(2)
STANDARDS
The pthread_atfork() function conforms to IEEE Std 1003.1c-1995 (``POSIX.1'').
HISTORY
The pthread_atfork() function first appeared in NetBSD 2.0.
CAVEATS
After calling fork(2) from a multithreaded process, it is only safe to call async-signal-safe functions until calling one of the exec(3)
functions. The pthread_*() functions are not async-signal-safe, so it is not safe to use such functions in the child handler.
BUGS
There is no way to unregister a handler registered with pthread_atfork().
BSD
February 12, 2003 BSD